Snakeweed, the arch villain is at large. Having failed to sell bad magic to the real world, he wants to go back home. All he needs is the spell hidden in Felix's notebook. Snakeweed's visit leaves Felix reeling - and his parents literally rooted to the spot. Worse, the curse on them appears to be some sort of magical infection. There's only one solution. Felix must find a way back across the Divide to find a counter-charm that can save his parents and the Earth in time.